The theme song is literally the best I've heard in a drama ever . Amazing vocals , beautiful / realistic lyrics and good music . The plot is amazing and full of suspense . I love the cast as well but there are times that I wish the main "hero" was more clever . I prefer the second lead more than the main tho (female) and I wish there was a good ending for her as well It kept me interested and I even watched it all within a day (skipping only small parts) . The only thing I didn't like was the main girl's acting . A little bit cringy as well as boring . It's a must! Don't miss it , you'll regret it
